import random
stu=[]
for c in"ABCDEFGH":
    yz=(c,random.randint(40,100))
    stu.append(yz)
print(stu)
score=sum([s[1] for s in stu])
print('平均分：',score/len(stu))
stu2=[s for s in stu if s[1]<60]
print("不及格人数：",len(stu2))